Bobbin for sewing machine



FIG. 1 is a frontal view of a bobbin for sewing machine showing my new design;

FIG. 2 is left-side view thereof;

FIG. 3 is a top-side plan view thereof;

FIG. 4 is a bottom-side plan view thereof;

FIG. 5 is a cross-sectional view along a line A-A indicated in FIG. 1; and,

FIG. 6 is a frontal view of the bobbin for sewing machine installed on a sewing machine.

In the present design, a back view and a right-side view are the same with the frontal view. 

The ornamental design for a bobbin for sewing machine, as shown and described. 